function show()
{
document.getElementById("alert").style.visibility = "visible";
}
function hide()
{
document.getElementById("alert").style.visibility = "hidden";
}

function show2()
{
document.getElementById("alert2").style.visibility = "visible";
}
function hide2()
{
document.getElementById("alert2").style.visibility = "hidden";
}

function show3()
{
document.getElementById("alert3").style.visibility = "visible";
}
function hide3()
{
document.getElementById("alert3").style.visibility = "hidden";
}